If space is limited, do what I did. I have 2 1/2" exhaust with Langdon's Headers. I used "Chambered Mufflers" These are the same mufflers that are used in the late 60's side pipes on a Corvettes. They were also used only on ZL1 Cameros. Nice rumble at idle and cruise and at open flow when you floor the gas pedal.
Inexpensive too. I purchased mine from the corvette place in Illinois, Mid America Corvettes.
http://www.mamotorworks.com/ I remember they where $30 a piece. You can order them with 2.5"in & out or 3" in&out and either 18" or 22" long. The diameter of the muffler is only 3.5"
Call and ask for the mufflers only. The online price id much higher because it is aluminized and has extra tail pipes on it.
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